Nuclear-Weapon-Free Zones (NWFZ) At a Glance

What is a Nuclear-Weapon-Free Zone?

A nuclear-weapon-free zone (NWFZ) is a specified region in which countries commit themselves not to manufacture, acquire, test, or possess nuclear weapons. Five such zones exist today, with four of them spanning the entire Southern Hemisphere. The regions currently covered under NWFZ agreements include: Latin America (the 1967 Treaty of Tlatelolco), the South Pacific (the 1985 Treaty of Rarotonga), Southeast Asia (the 1995 Treaty of Bangkok) Africa (the 1996 Treaty of Pelindaba) and Central Asia (the 2006 Treaty of Semipalatinsk).

Background

Initial efforts to create an area free of nuclear weapons began in the late 1950s with several proposals to establish such a zone in Central and Eastern Europe. Poland offered the first proposal-named the Rapacki Plan after the Polish foreign minister-in 1958. The Rapacki Plan sought to initially keep nuclear weapons from being deployed in Poland, Czechoslovakia, West Germany, and East Germany, while reserving the right for other European countries to follow suit. The Soviet Union, Sweden, Finland, Romania, and Bulgaria also floated similar proposals. All these early efforts, however, floundered amidst the U.S.-Soviet superpower conflict, although the Rapacki Plan would serve as a model to the nuclear-weapon-free zones that were eventually set up in other regions of the globe.

Article VII of the nuclear Nonproliferation Treaty (NPT), which entered into force in 1970, affirms the right of countries to establish specified zones free of nuclear weapons. The UN General Assembly reaffirmed that right in 1975 and outlined the criteria for such zones. Within these nuclear-weapon-free zones, countries may use nuclear energy for peaceful purposes.

Protocol for Nuclear Weapon States

Each treaty establishing a nuclear-weapon-free zone includes a protocol for the five nuclear-weapon states recognized under the NPT-China, France, Russia, the United Kingdom, and the United States-to sign and ratify. These protocols, which are legally binding, call upon the nuclear-weapon states to respect the status of the zones and not to use or threaten to use nuclear weapons against treaty states-parties. Such declarations of non-use of nuclear weapons are referred to as negative security assurances. For more information, see Nuclear Declaratory Policy and Negative Security Assurances.

However, the five nuclear-armed countries have at times signed and ratified a NWFZ protocol and declared conditions reserving the right to use nuclear weapons in certain scenarios against parties to a nuclear-weapon-free zone. For instance, the United States signed the protocol for the African nuclear-weapon-free zone in April 1996 with a declaration that it would reserve the right to respond with all options, implying possible use of nuclear weapons, to a chemical or biological weapons attack by a member of the zone. None of the nuclear-weapon states have signed the relevant protocol for the treaty creating a zone in Southeast Asia because of concerns that it conflicts with the right of their ships and aircraft to have freedom of movement in international waters and airspace and problems with the definitions of territory, since includes exclusive economic zones and continental shelves. The other three zones do not explicitly rule out the transit of nuclear weapons by nuclear-weapon states through the zones, and the general practice of nuclear-weapon states is not to declare whether nuclear weapons are aboard their vessels.

In addition to nuclear-weapon-free zones, there are treaties and declarations, which are not covered by this fact sheet, banning the deployment of nuclear weapons in Antarctica, Mongolia, on the seabed, and in outer space.

Basic Elements of Nuclear-Weapon-Free Zone Treaties

Duration: The treaties are to remain in force indefinitely. Yet, each treaty includes a withdrawal option for states-parties. With the exception of the Treaty of Tlatelolco, which simply requires three months' advance notice before a withdrawal can take effect, all the NWFZ treaties require 12 months' advance notice for a state-party to end its treaty obligations.

Conditions: None of the treaties can be subjected to conditions by its non-nuclear-weapon states-parties.

Verification: Each state-party adopts comprehensive safeguards administered by the International Atomic Energy Agency (IAEA), which verifies that states-parties are not pursuing nuclear weapons illicitly. The Central Asian NWFZ goes a step further in requiring that states in the region adopt the IAEA's Additional Protocol, which provides for expanded monitoring.

Territory Covered: Each zone applies to the entire territories of all of its states-parties. Territory is understood to include all land holdings, internal waters, territorial seas, and archipelagic waters. The Latin American treaty also extends hundreds of kilometers from the states-parties' territories into the Pacific and Atlantic Oceans, but the nuclear-weapon states, citing their freedom at sea, assert that this does not apply to their ships and aircraft that might be carrying nuclear weapons. A dispute also exists over the inclusion of the Chagos Archipelago, which includes the U.S. military base at Diego Garcia in the Indian Ocean, as part of the proposed African nuclear-weapon-free zone. Neither the United States nor the United Kingdom recognizes Diego Garcia as being subject to the Pelindaba Treaty.

Opened for signature: December 15, 1995Entered into force: March 27, 1997

States-Parties

Signed

Ratified

Brunei Darussalam

December 15, 1995

November 22, 1996

Cambodia

December 15, 1995

March 27, 1997

Indonesia

December 15, 1995

April 10, 1997

Lao People’s Democratic Republic

December 15, 1995

July 16, 1996

Malaysia

December 15, 1995

October 11, 1996

Myanmar

December 15, 1995

July 17, 1996

Philippines

December 15, 1995

June 21, 2001

Singapore

December 15, 1995

March 27, 1997

Thailand

December 15, 1995

March 20, 1997

Vietnam

December 15, 1995

November 26, 1996

Protocol ratification by nuclear-weapon states:

None. Five nuclear weapons states and ASEAN members met in July 2012 to sign the treaty protocol. The treaty commission, however, postponed the signing of the protocol until November, requesting more time to review reservations that several of the NWS indicated that they would attach during ratification.

Opened for signature: September 8, 2006Entered into force: March 21, 2009

States-Parties

Signed

Ratified

Kazakhstan

September 8, 2006

February 19, 2009

Kyrgyzstan

September 8, 2006

July 27, 2007

Tajikistan

September 8, 2006

January 13, 2009

Turkmenistan

September 8, 2006

January 17, 2009

Uzbekistan

September 8, 2006

May 10, 2007

Protocol ratification by nuclear-weapon states:

Protocol

Subject

States Ratified

Protocol I*

Negative security assurances

China, France, Russia, United Kingdom

*United States signed but has not ratified

Notes:

1. The treaty specified that the full zone would not enter into force until it was ratified by all states within the zones. That did not occur until Cuba ratified the treaty in 2002. However, the treaty permitted individual states to waive that provision and declare themselves bound by the treaty, which many did beginning in 1968.